Unified Communication as a Service (UCaaS) Market Size, Share & Industry Analysis, By Component (Telephony, Unified Messaging, Collaboration Platforms, Conferencing, and Others), By Delivery Model (Managed Services and Hosted/Cloud Services), By Enterprise Type (Large Enterprises and Small and Medium-sized Enterprises (SMEs)), By Vertical (BFSI, IT and Telecommunications, IT-enabled Services (ITeS), Education, Retail and Consumer Goods, Government and Defense, Healthcare, and Others), and Regional Forecast, 2024-2032